Aqueous urea solution decomposing mixing device

Abstract

The invention discloses an aqueous urea solution decomposing mixing device. A spoiler and a pore plate are arranged between a front shell and a rear shell. The spoiler and the pore plate divide an inner cavity into an upper spraying cavity, a middle flow guide cavity and a lower rotational flow cavity. A top cover is arranged at the top of the rear shell. An inclined plane is arranged in the spraying cavity, and an included angle is formed between the vertical plane and the inclined plane. A flow guide plate is provided with a flow guide vane. The spoiler is provided with a turbulent flow vane. A rotational flow plate is provided with a rotational flow vane outwards through a third vane hole. The inner cavity of the aqueous urea solution decomposing mixing device is divided into the spraying cavity, the flow guide cavity and the rotational flow cavity only through the spoiler and the pore plate. Little blocking occurs in an airflow channel, the airflow channel is smoother, mixed airflow passes through few turning points in the airflow channel, energy loss is small, and the airflow pressure drop is low. The top cover is provided with an inclined lower plane, and the spraying cavityforms a cavity which is asymmetric along the vertical plane. A nozzle seat is located in a low position of the lower plane, and thus the urea spraying line is toward the direction directly facing thedirection of the turbulent flow vane of the spoiler.

Description

technical field [0001] The invention relates to the technical field of after-treatment of automobile exhaust, in particular to a urea aqueous solution decomposition and mixing device. Background technique [0002] With the continuous growth of the number of automobiles, the pollution of the atmospheric environment by the emission of automobile exhaust is becoming more and more serious. Nitrogen oxides (NOx) from car engines X ) is one of the main sources of air pollution. In order to reduce the pollution of engine emissions to the atmosphere, it is necessary to treat the exhaust emissions of automobile engines. At present, automobile engines usually use selective catalytic reduction technology (SCR) to post-treat exhaust emissions. The urea aqueous solution in the urea tank is sprayed into the exhaust pipe through the urea injection system, and the urea aqueous solution is decomposed into ammonia gas at the temperature of the exhaust gas ( NH 3 ), under the action of cata...

AI Technical Summary

Problems solved by technology

[0004] The applicant aims at the high pressure drop of the mixed air flow in the packaging system between the DPF and the SCR in the above-mentioned existing post-processing, crystallization is easily formed on the inner wall surface of the transition shell and the transition post plate, and the air flow mixing uniformity is not high enough, zero Due to the disadvantages of high component cost and assembly cost, a urea aqueous solution decomposition and mixing device with a reasonable structure is provided, the air flow pressure of the mixed air flow is reduced, crystals are not easily formed on the inner wall of the end cover, the air flow mixing uniformity is high, and the cost of parts and assembly is relatively low. Low

Images